机械
马赫数
理想气体
泄漏(经济)
二氧化碳
体积流量
压力降
氢
天然气
材料科学
压缩性
螺旋(铁路)
湿气
迷宫式密封
压缩系数
热力学
化学
复合材料
工程类
机械工程
物理
经济
有机化学
宏观经济学
刚度
作者
Hengjie Xu,Pengyun Song,Wenyuan Mao,Qiangguo Deng
标识
DOI:10.1177/1350650119891563
摘要
By taking carbon dioxide and hydrogen as lubricating gas, respectively, this paper presents an analysis on the pressure characteristics and temperature distribution of spiral groove dry gas seal which influenced by real gas effect under choked flow condition. Numerical results show that the deviation between real gas and ideal gas, which expressed by the deviation degree between compressibility factor Z and 1, is the main reason for real gas effect affecting sealing performance. Compared with ideal gas model, real gas effect raises exit pressure, opening force, leakage rate, Mach number in dam region, and temperature for carbon dioxide ( Z < 1), while it decreases those characteristics for hydrogen ( Z > 1) under the same operating conditions. In addition, choked flow effect increases opening force and reduces leakage rate and temperature-drop between entrance and exit of sealing clearance. Meanwhile, it may cause an unstable behavior for the seal.
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